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(No Model.)

1). o. OAIWLEY & o. P. WALL.

v WINDOW VENTILATOR. "No. 347,158.

PatentSdAugLIO, 1-886.

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UNITED 4 STATES PATENT OFFIC DANIEL O. CAWLEY AND CHARLES P. YVALL, OFPITTSBURG, PA.

WI NDOW-VENTI LATO R.

SPECIFICATION forming part of Letters Patent No. 347,158, dated August10, 1886.

Application filed January 9, 1886. Serial No. 188,151. (No model.)

To all whom it may concern:

Be it known that we, DANIEL O. GA-WLEY and CHARLES P. WALL, ofPittsburg, in the county of Allegheny and-State of Pennsylvania, haveinvented a new and useful Improvement in Means for Keeping Show-WindowsFree from Condensation, of which the following is a description.

Figure l is a vertical section through the show-window and cellar of astore with our invention applied. vFig. 2 is an inside view of thewindow, showing the arrangement of pipes in the same.

The object of our invention is to provide a means for preventing thecondensation of vapor upon show-windows and its congelation there in theform of frost. In cold weather or high latitudes this difficulty existsto such an extent as to defeat the primary object of show-windows byrendering it impossible to see through the same.

Heretofore a series of gasjets has been arranged on the inside of andnear the bottom of show-windows for this purpose; but the ob- 2 5jection to it is that it involves a great risk of fire to the hangingdraperies and inflammable contents of the window. An air-pipe has alsobeen arranged under the floor and made to carry air around asteam-radiator up into the window; but this is only applicable tosteamheated buildings, and involves a great expense also.

Our invention consists in combining with a series of perforated pipesdisposed at the bottom and sides of the window a pendent draftpipeextending down into the cellar and a gas-burner at the lower end of saidpipe, which, by a proper mixture of air and gas, secures a perfectcombustion in the draft-pipe, which latter, by its length, secures aproper draft to the gas-burner and delivers the hot air and gasesthrough the perforated pipes above into close proximity with thewindow-glass, which prevents the vapors from condensing and freezingthereon.

In the drawings, A represents the pendent draft-pipe, which extends fromthe bottom of the window down into the cellar. Bis an air and gas mixingand burning tube, which receives its gas through tube 0 and its airthrough openings a around said gas-tube.

and deposits of lampblaok.

The gas mixer and burner B connects with and discharges its hot air andgases into the lower end of draft-pipe A, the upper end of whichcommunicates with the perforated horizontal pipe E at the bottom of thewindow. near the glass. From this horizontal pipe E perforated sidepipes, E, arise, and from these latter one or more perforatedcross-pipes, E, extend in horizontal direction at suitable intervals.These horizontal pipes E may be in the nature of swinging arms,which,when not in use, may turn in a horizontal plane and be utilized inwarm weather as supports or bracket-arms for displaying the goods in thewindow.

In securing a proper draft and admixture of air for perfect combustionwithin the tube, we sometimes employ a fan-blower, D, discharging airinto the lower end of tube A,and when said fan-blower is not. used Wefind that the lower end of tube A should be left open to secure aperfect combustion free from smoke The burner B, moreover, need notoccupy a horizontal position, but may be arranged vertically, as aBunsen burner. This means of keeping the window-glass clear andtransparent does not involve the risk from fire on the one hand nor thegreat expense of steam-radiators on the other, and yet it is perfectlyeffective and universally applicable whenever gas is employed. Its costis also trifling, as it only involves the use of a few lengths ofgas-pipe and a few hours work, which any plumber can supply.

In some cases we may dispense with the burner, and by means of theblower D simply force a blast of cold air up over the window; which insome cases is sutlicient to keep it free from condensation.

What we claim as new is- 1. The combination, with one or more perforatedpipes arranged near the glass of a showwindow, of a pendent draft-pipe,A, leading down into the cellar, and an air-mixing burner arranged atthe lower end of the draft-pipe, substantially as shown and described.

2. The combination, with one or more perforated pipes arranged near theglass of a show- Window, of a pendent draft-pipe, A, leading down intothe cellar, an air-mixing burner arrangedat the lower end of thedraft-pipe, and

an air-blower, also communicating with the dow, and also serving asdisplay arms 01' bracklower end of draft-pi pe, substantially as shownots, substantially as shown and described.

and described. DANIEL O. CAW'LEY.

3. The combination, with vertical hot-air CHAS. P. \VALL. 5 pipesarranged in a window, of horizontally- \Vitnesses:

swinging arms having perforations for dis- G150. HADFIELI),

tribnting hot air over the surface of the win- ABRAHAM \VESTERVELT.

